A cold front advancing through a moist and unstable airmass triggered a severe thunderstorm squall line which tore through much of west and central Upper Michigan on the morning and early afternoon of the 9th.  The squall line produced widespread damage to large trees and power lines.  The Upper Peninsula Power Company estimated around 175 customers in the Witch Lake area of western Marquette County were without power due to the storms.

Thunderstorm Wind in DELTA, MICHIGAN
From 09-AUG-05 11:35:00 to 09-AUG-05 11:40:00 (EST)
Location: STONINGTON
Magnitude: 70 EG
Reported by: DEPT OF HIGHWAYS

Numerous trees down on power lines on the Stonington Peninsula.

Thunderstorm Wind in LUCE, MICHIGAN
From 09-AUG-05 12:30:00 to 09-AUG-05 12:30:00 (EST)
Location: NEWBERRY
Magnitude: 60 EG
Reported by: LAW ENFORCEMENT

Six to eight-inch diameter tree down on County Road 460.

Thunderstorm Wind in LUCE, MICHIGAN
From 09-AUG-05 12:30:00 to 09-AUG-05 12:30:00 (EST)
Location: NEWBERRY
Magnitude: 60 EG
Reported by: LAW ENFORCEMENT

Tree down on home on County Road 458, one-half mile east of County Road 117.

Thunderstorm Wind in SCHOOLCRAFT, MICHIGAN
From 09-AUG-05 11:30:00 to 09-AUG-05 11:35:00 (EST)
Location: STEUBEN
Magnitude: 70 EG
Reported by: TRAINED SPOTTER

Awnings blown off campers.  Trees down.

Thunderstorm Wind in ALGER, MICHIGAN
From 09-AUG-05 11:15:00 to 09-AUG-05 11:20:00 (EST)
Location: TRENARY
Magnitude: 80 EG
Reported by: DEPT OF HIGHWAYS

Numerous trees down on Forest Highway H05.  Trees blocked north and south bound lanes and stranded vehicles betweeen the trees.

Thunderstorm Wind in DELTA, MICHIGAN
From 09-AUG-05 11:15:00 to 09-AUG-05 11:20:00 (EST)
Location: ESCANABA
Magnitude: 65 EG
Reported by: TRAINED SPOTTER

Several six to eight-inch diameter trees down around 16th Avenue and 16th Street.

Thunderstorm Wind in ALGER, MICHIGAN
From 09-AUG-05 11:10:00 to 09-AUG-05 11:10:00 (EST)
Location: MUNISING
Magnitude: 60 EG
Reported by: TRAINED SPOTTER

Power lines down.  65-foot maple tree down.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-05 10:00:00 to 09-AUG-05 10:05:00 (EST)
Location: WITCH LAKE
Magnitude: 75 EG
Reported by: TRAINED SPOTTER

Numerous trees and power lines downed.

Thunderstorm Wind in GOGEBIC, MICHIGAN
From 09-AUG-05 08:00:00 to 09-AUG-05 08:05:00 (CST)
Location: WATERSMEET
Magnitude: 65 EG
Reported by: LAW ENFORCEMENT

Power outages and several trees down.

Thunderstorm Wind in IRON, MICHIGAN
From 09-AUG-05 08:38:00 to 09-AUG-05 08:38:00 (CST)
Location: IRON RIVER
Magnitude: 80 MG
Reported by: TRAINED SPOTTER

89 mph measured wind gust.

Thunderstorm Wind in IRON, MICHIGAN
From 09-AUG-05 08:35:00 to 09-AUG-05 08:40:00 (CST)
Location: BEECHWOOD
Magnitude: 80 EG
Reported by: TRAINED SPOTTER

Numerous large trees blown down in a three-mile swath.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 09-AUG-05 08:55:00 to 09-AUG-05 08:55:00 (CST)
Location: CHANNING
Magnitude: 70 EG
Reported by: TRAINED SPOTTER

Six-inch diameter tree snapped and 12-inch diameter tree blown over on Turner Road.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 09-AUG-05 10:40:00 to 09-AUG-05 10:45:00 (EST)
Location: MC FARLAND
Magnitude: 70 EG
Reported by: LAW ENFORCEMENT

Several trees down along Highway M-35.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 09-AUG-05 09:52:00 to 09-AUG-05 09:52:00 (CST)
Location: PERRONVILLE
Magnitude: 60 EG
Reported by: DEPT OF HIGHWAYS

One tree down and several tree limbs down.

Thunderstorm Wind in ALGER, MICHIGAN
From 09-AUG-05 11:00:00 to 09-AUG-05 11:05:00 (EST)
Location: TRENARY
Magnitude: 75 EG
Reported by: LAW ENFORCEMENT

Numerous trees down on Highway US-41.  One lane of the highway was blocked.

Thunderstorm Wind in DELTA, MICHIGAN
From 09-AUG-05 11:05:00 to 09-AUG-05 11:10:00 (EST)
Location: PERKINS
Magnitude: 70 EG
Reported by: DEPT OF HIGHWAYS

Numerous trees down in Perkins and Brampton.